Thread-cutter for bag-sewing machines.



n PATENTED AUG. 2s, 1904.

E. H BURGHARDT.

THREAD GUTTER FOR BAG SEWING MACHINES.

- APPLIUATION FILED 00T.,1903. v No MoDBL. y 3 SHBBTSAHBB'I 1.

f f {ll IV l) it 1 I, $9/ /l A a O 22, n

EATENEEE AUG. 2s, '1904.l

" E. E. EUEGHAEDT.

- EEEEAE GUETEE EOE EAG SEWING MACHINES.

APPLLOATION FILED 00T. 6, 1903.

3 SHEETS--SHEET 2.

No. mm1.

, PATENTEDAUG. 2a, 1904.

E. H. BURGHARDT. THREAD GUTTER PoR BAG SEWING MACVHINBS.

AlPLIGATIUN FILED 00T. 6, 1903.

. YUN-ITED STATES Patented August 2e, 19021.

RATINT'v OFFICE.

-nDWAina/II.l RURGIIARDT, OF ST. PAUL, MINNESOTA, ASSIGNOR To WASH- BuRN-OROSBY oo., OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

"THB'EADf'cUTTEn FOR BAG-SEWING iiliAc'si-iiiiis'.v

sPncIFIcATIoN- frming pare lof '1.2mm Patent No. 768,111, dated August es, 1904, .appiimion died october 6,1903. stanno. 175,929.' (No moda.)

To n.7] whom "it mag/concent;

Beit known that I, EDWARD H. BURGHARDT,

p ofSt. Paul, county of Ramsey, State of Minne- Sota, have invented certain new and useful Improvements in Thread-Cutters 'for Bag-Sewing Machines, ofl which the followingisa specification.

My invention relates to machines for sewingup or closing the mouth 'of a sack or bag" after it has been filled; and the object of the invention is to provide means for severing the thread after the sack has been sewed up..y l A further object is to effect a saving in y lthread by stopping the sewing mechanismimcompleted.

have illustrated merely to show the applica.

mediately after the sewing operation h asbeen The invention consists generally in pro# viding means for automatically severing' the thread as soon. as the sewing-operation is coin- ,pleted. d

Further, the invention consists in various constructions and combinations, all as hereinafter described, and particularly pointed out in the claims.l l y 'In they accompanying drawings', forming vpart ofl 4this specification, Figure 1 is a front View of a bag-sewing machine-embodying my Invention. Fig. 2 1s a side elevation of the same. Fig. 3 is a horizontal section on the line a' m of Fig. 2. Fig. 4 is a horizontal sec- I tion on the line y y of Fig. 2. Fig. 5 isa detail of one of the 'clutch mechanisms. Fig.l 6 is a perspective view showing the severing device in the act of cutting the thread.

- 1n the drawings, 2 represents'a bag-sewing machine of the type in general use, which I 4tion and operation of' my invention;

3 is a feed-belton which the sacks containing Hour' or other material arel placed. 4 4 is the needle driven by the belt 5 from a Vpulley 6, S`ecured on avertically-arranged shaft 7. This-shaft is normally stationary.

Near the lower end'of the shaft 7 1 provide a continuously-running loose pulley 8, having a conical recess 9 in its under side to receive a cone-faced member 10, that is secured on the shaft 7 l. The pulley 8 and the member 10 form the two parts of-a cone friction-clutch through *which the shaft 7 isdriven. A belt l11 is provided on the pulley 8 to operate the y oppositev end of said arm being mounted on a.

rock-shaft 15, that is provided with a' cr'ank 16, connected by a link 17 with a crank 18 on a rockjshaft or Vrod-19,:that has an upwardlyturned end 2() in position to be engaged andv -oscillated by the knee ofthe lopeiatorin A cup-shaped mem' charge'of the machine. ber .2l isl secured on the 'shaft4 7- near the upper end thereof, forming one member of a second cone-clutch, the other part 22 of Awhich is loosely mounted on the'shaft 7 and arranged to slide vertically thereon to engage the member 21 or be moved out of contact therewith. An arm 23 is secured to the member 22 and connected with the arm 1-4 members 21 and22 in contact with each other and the pulley 8 out of contact with the friction-cone 10.

26 is a'member arranged toreciprocate in a guide 27 and connected with. the arm 2 3'. The member 26 at its forward end isprovided with abeveled cutting edge 28, form-` ing a stationary jaw, and a movable jaw 29, having a cutting edge 30, is pivoted on' the forward end ofthe member 26 and forms therewith a scissors-like device that is adapt# edito engage and sever the thread whenthel member 26 is projected. A lug 31 -is pro- .vided in the pathof, the movable jaw 29 to engag'e the same and swing its cutting edge toward the corresponding edgeof the nneIn'A ber 26., and a stud 31 lis mounted on the member 26 in position to engage the guide 27 and limit the forward movement of the severing device when it is projected to cut the thread.

On'the return movement ofthe member26- the jaw 29 will be engaged by an edge 29 "on said guide and returned thereby toits normal position.

The friction-clutch members 21 and 22 not only serveto actuate the thread-severing device, but act as a brake toA arrest the revolw' 'tion-'of the driven shaft 7 and stop the sewling mechanism immediately following the sewing operation, thereby affecting aconsid- 'erable saving in thread with every bag sewed. 'The operation of the device is as follows: The attendant having placed the filled sack i the carrier will press the arm 2O toward toward the sack.

the right, causing the continuously moving pulley 8 to slide down into engagement with the friction-cone 10 and move the cone 22 out of'contact with the member 2l against they tension of the spring 25. The shaft7 will be set in motion, and from its eonnection'with said shaft the sewing mechanism will be started to sew up the open mouth of the sack. As soon as the sack has been sewed the operator will release the arm 2O and the spring 25 'v will raise the pulley 8 out of engagement with shaft 7 will have lost its momentum and will -have stopped, and the spring 32 will return the cutting or severing device to its normal position. The o peration of sewing up the sack and cutting the thread-.may thenbe re peated.

' i claim as; my inventionl. The combination, witha sewing-machine, of a normally stationary shaft,aclutch mounted on said shaft and comprising a continu-l .inning loosely-mounted member and a fixed member, an operating device connected with said loosely-mounted member, a secr ond clutch comprising a member fixed on'said shaft and a part slidabe thereon, means conneeting said operating device and said sliding part, and a reciprocating threadsevering` device connected with said sliding part and arranged to be projected against the thread b v the momentum of said shaft when said firstnamed clutch is operated to stop the machine.

2. rlhe combination, with a sewing meehanism and means for operating the same, of a friction-clutch mechanism within control of the operator for disconnecting said sewing mechanism from said operating means, a

thread-severing device having operative connections with said sewing mechanism, and a second friction-clutch connected with said operating means and said threadsevering device and arranged to operate the latter through the momentum of said sewing mechanism immediately following the operation of said lirstnamed clutch.

3. 1n a bag-sewing machine. the combination, with a sewing mechanism and means for operating the same, of means within control of the operator for disengaging said mechansm from said operating means, a reciprocating jaw having a cutting edge and operatively connected with a moving part of said mechanism, a second jaw also having a cutting edgemonnted on said first-named jaw, a lug arranged in the path of said second jaw and adapted to move its cutting edge toward the edge of said first-named jaw when they are projected toward the thread, means for retracting said jaws, and an inclined surface arranged to engage Said second jaw and separate its cutting edge from the eorrespomlin g edge of said iirst-named jaw when they are retracted.

In witness whereof i have hereunto setmy hf-tnd this 30th day of September, 1903.

EDWARD H. BURGHARD'I.

in presence of RICHARD PAUL, C. Gr. HAUsoN. 

